JP5066506B2 - Coil spring forming method and coil spring - Google Patents

Description

The present invention relates to a coil spring forming method and a coil spring, and more particularly to a coil spring forming method capable of accurately forming coil springs having various pitches and pitch angles, and a coil spring formed by the coil spring forming method .

  As a coil spring forming device, for example, a device having a cored bar and a lead screw provided in parallel to the cored bar is known. The lead screw of the coil spring forming apparatus is formed with a spiral groove corresponding to the pitch and pitch angle of the coil spring to be formed. In the coil spring forming device, the wire is wound around the core at a predetermined pitch and pitch angle by guiding the wire onto the core by the spiral groove of the lead screw while rotating the core and the lead screw. Manufacture coil springs.

  However, the coil spring forming apparatus is remarkably troublesome in the design and manufacture of the lead screw, lacks versatility because only a coil spring having a pitch and a pitch angle corresponding to the spiral groove of the lead screw can be manufactured, and the pitch in the middle In addition, there are various problems such as extremely difficult manufacture of a coil spring in which the pitch angle changes greatly.

  Therefore, a winding machine using a pulley-shaped guide instead of the lead screw has been developed. The winding machine includes a cored bar and a single pulley-shaped guide disposed at a position spaced apart in the radial direction of the cored bar, and the pulley-shaped guide is predetermined along the axial direction of the cored bar. Move at speed. The wire is wound around the core while being guided by the pulley-shaped guide. At this time, by controlling the moving speed of the pulley-shaped guide, the pitch and pitch angle of the obtained coil spring can be controlled.

  However, in the winding machine, since the pulley-shaped guide is disposed at a position away from the cored bar, the wire is not directly guided on the cored bar. Therefore, it is necessary to control the movement of the pulley-shaped guide while predicting the pitch and pitch angle when the wire is actually wound on the core metal.

  For this reason, there is a problem that not only it takes time to create input data for controlling the pulley-shaped guide, but also the pitch of the obtained coil springs varies. In addition, since the pulley-shaped guide and the cored bar are separated from each other as described above, the movement of the wire cannot be directly controlled on the cored bar. It was difficult to make the movement of the guide follow the change. Then, if the guide is forcibly moved to follow the change in pitch, the wire rod slips on the core bar, causing the pitch to vary.

As a solution to the problems of the winding machine, a cored bar, a cored bar drive mechanism, a chuck for holding the tip of the wire rod and fixing it to the cored bar, and a guide member arranged in parallel with the cored bar, A movable head that is held by the guide member and is movable in a direction parallel to the cored bar, and a movable head provided on the movable head and reciprocating in a direction contacting and separating from the cored bar and the diameter of the cored bar A first holder capable of turning about an axis extending in a direction, a guide drive mechanism that reciprocates in a direction to move the first holder toward and away from the core, and a coil spring provided in the first holder A first guide having a groove portion to be fitted to the material, and the movable head so that the first guide moves in the axial direction of the core metal at a speed related to the rotation speed of the core metal according to the pitch of the coil spring. An axial drive mechanism for moving the first and the first A second holder that swirls together with the rudder, a second guide that is provided in the second holder and that contacts the material so that the material does not come off and feeds the material toward the first guide, A winding machine has been proposed that includes an angle changing actuator that controls the orientation of the holder so that the first guide and the second guide are interlocked with each other and face the direction according to the pitch angle of the coil spring (patent) Reference 1).
JP-B-2-33460

  In the winding machine, the winding of the wire is started after the tip of the wire is grasped by the chuck and fixed on the core, and as described above, the first guide contacts and separates from the core. A second guide that is provided in one holder and guides the wire together with the first guide is provided in a second holder that rotates integrally with the first holder. Therefore, when starting the winding of the wire rod, the first guide and the second guide need to be retracted to a position separated from the core metal. It was difficult to control accurately.

  Further, since the first holder and the second holder can only move integrally around an axis extending in the radial direction of the core bar, the first guide and the second guide can be taken. The relationship is also limited. Therefore, the pitch and pitch angle of the coil spring to be manufactured are naturally limited.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a coil spring forming apparatus that can accurately manufacture coil springs having various pitches and pitch angles.

The invention according to claim 1 relates to a coil spring forming method, a columnar core that rotates around an axis, a clamp portion that is provided at one end of the core and rotates integrally with the core, and Forming a coil spring having a first guide member and a second guide member which are provided so as to be movable independently of each other along a direction parallel to the axis of the core metal and which guide the wire onto the core metal While the wire rod is being fed from the wire rod supply means toward the core bar in a state where one end of the wire rod to be wound around the core bar is gripped on the core bar by the clamp portion using the apparatus, the core While rotating the gold around the axis, the first guide member is in contact with the wire between the second guide member that contacts the wire and the position where the wire starts to be wound around the core, The first guide member and the first guide member; And a second guide member is moved from one end to the other end of the metal core, characterized in that winding the wire on the core metal.

In the coil spring forming apparatus used in the coil spring forming method, the wire supplied from the wire supply means is guided toward the winding start position on the core metal by the second guide member and the first guide member. And a front-end | tip part is fixed on a metal core with a clamp part.

  When the tip of the wire is fixed on the core, the core rotates in the winding direction of the coil spring, and at the same time, the first guide member and the second guide member move parallel to the axis of the core and the wire Is guided on the core bar at a predetermined pitch and pitch angle.

  In the coil spring forming apparatus, the first guide member and the second guide member are moved at a constant speed equal to each other, whereby a coil spring having a constant pitch and a pitch angle can be formed. Further, when the first guide member and the second guide member are moved at the same speed and the speed is increased, the pitch and the pitch angle are increased along the moving direction of the first guide member and the second guide member. Can do. On the contrary, when the first guide member and the second guide member are moved at the same speed and the speed is decreased, the pitch and the pitch angle are changed along the moving direction of the first guide member and the second guide member. Can be reduced.

  Further, if the second guide member is moved at a higher speed than the first guide member while moving the first guide member at a predetermined speed, the wire is bent around the first guide member, and the bent portion is The wire is wound at a larger pitch and pitch angle on the downstream side along the moving direction of the first guide member and the second guide member as a boundary. On the other hand, when the second guide member is moved at a speed lower than that of the first guide member while the first guide member is moved at a predetermined speed, the first guide member and the second guide line are separated from the bent portion of the wire. The wire is wound at a smaller pitch and pitch angle on the downstream side along the moving direction of the guide member.

  As described above, in the coil spring forming apparatus, by setting the moving speeds of the first guide member and the second guide member, not only the coil spring with a constant pitch but also the coil spring with the pitch increasing along the axial direction and the decrease And a coil spring in which a wire is wound at a larger or smaller pitch at a predetermined position along the axial direction.

According to a second aspect of the present invention, in the coil spring forming method according to the first aspect, at the start of winding of the wire rod, the portion adjacent to the portion gripped on the core metal by the clamp portion of the wire rod is Of the first guide member and the second guide member, the first guide member is held by the first guide member disposed on the side closer to the core metal.

In the coil spring forming method , the first guide member holds a position offset from the winding start position of the wire to the side closer to the wire supply means at the start of winding. Therefore, since the wire is guided along the predetermined path by the first guide member and the second guide member from the start of winding, the pitch and pitch angle of the coil spring can be accurately controlled even at the start of winding. Therefore, it is possible to accurately form the one having flat seats at both ends, such as a coil spring for automobile suspension.

The coil spring forming apparatus used in the coil spring forming method of the present invention, prior Symbol first guide member and the second guide member, a pair of guide rollers disposed to both sandwich the path of the wire In addition, the guide roller includes a coil spring forming device that contacts the wire from above in the first guide member and from below in the second guide member .

  In the coil spring forming apparatus, since both the first guide member and the second guide member include a pair of guide rollers disposed so as to sandwich the path of the wire, the first guide member and the second guide member In any case, the wire can be smoothly fed regardless of the relative angle with the wire. Further, in the first guide member on the side close to the cored bar, the wire rod is pressed from above, so that the coil spring can be formed more stably.

In the coil spring forming apparatus used in the coil spring forming method of the present invention, the second guide member further includes a pair of guide rollers disposed so as to sandwich the path of the wire, and the first guide member A guide roller having a groove that fits into the wire, and supports the guide roller rotatably around an axis, and around a rotation axis orthogonal to the axis of the guide roller and the supply path of the wire A coil spring forming device including a guide roller support member formed so as to be rotatable is also included.

  In the coil spring forming apparatus, since the wire can be smoothly fed regardless of the relative angle between the second guide member and the wire, even when the first guide member and the second guide member are moved at different speeds. The second guide member does not break the wire. In addition, when the first guide member and the second guide member are moved at different speeds in the coil spring forming apparatus, the wire is bent at the position of the first guide member. At that time, the wire is removed from the groove of the guide roller. The force to drop off acts between the wire rod and the guide roller. However, in the first guide member, the guide roller support member rotates around the rotation axis so that the groove direction of the guide roller coincides with the direction of the wire after bending, so that the wire is detached from the guide roller by the force. Or the guide roller is prevented from being damaged by being rubbed strongly into the groove of the guide roller.

A third aspect of the present invention relates to a coil spring, which is formed by the method for forming a coil spring according to the first or second aspect, has a first portion having a first pitch angle θ1, and the first pitch angle. a second portion having a second pitch angle θ2 different from θ1, but the pitch angle continuously shifts from θ1 to θ2 between the first portion and the second portion. It is characterized by not having a transition part.

As described above, according to the present invention, a coil spring forming method capable of accurately manufacturing coil springs having various pitches and pitch angles is provided.

1. Embodiment 1
A winding machine as an example of a coil spring forming apparatus used in the coil spring forming method of the present invention will be described below.
As shown in FIGS. 1 and 2, the winding machine 1 according to the first embodiment includes a cylindrical cored bar 2 around which a wire W is wound, and a wire W supplied from a supply unit (not shown). The first guide portion 3 and the second guide portion 4 that guide the guide toward the metal core 2 are provided.

  The first guide part 3 and the second guide part 4 are moved in parallel to the axis of the cored bar 2 by the ball screw mechanism 5 and the ball screw mechanism 6. The ball screw mechanism 5 and the ball screw mechanism 6 are provided on a plate-like substrate 9 provided parallel to the cored bar 2. A guide rail 7 is provided at the lower edge portion of the surface of the substrate 9 on the side where the ball screw mechanism 5 and the ball screw mechanism 6 are provided, in parallel with the cored bar 2, and near the upper edge portion of the surface. A rail 8 is provided. The lower edge portion of the first guide portion 3 and the second guide portion 4 is slidably engaged with the guide rail 7, and the upper edge portion of the first guide portion 3 and the second guide portion 4 is engaged with the guide rail 8. It is slidably engaged. Accordingly, the first guide portion 3 and the second guide portion 4 are guided so as to move in a plane parallel to the substrate 9.

Hereinafter, the detail of each part of the winding machine 1 is demonstrated.
As shown in FIGS. 1 to 4, a flange portion 20 protrudes outward from one end portion of the core metal 2 along the radial direction, and a motor 24 is attached to the other end portion. The core metal 2 rotates around the axis along the direction in which the wire W is wound by the motor 24. At one end of the cored bar 2, a clamp part 22 that contacts and separates from the cored bar 2 and rotates integrally with the cored bar 2 is provided adjacent to the flange part 20. The wire W is gripped on the core metal 2 by the clamp portion 22 approaching the core metal 2.

  As shown in FIGS. 1 to 3, the first guide portion 3 includes a pair of first guide rollers 30 that rotate in contact with the wire W, and a support plate 32 on which the first guide roller 30 is pivotally supported. The upper and lower ends are supported and guided by the ball screw mechanism 5, the guide rail 7 and the guide rail 8, and the base 34 is supported at one end, and the support plate 32 is connected to the vertical rotation shaft at the other end. And an arm-like member 36 rotatably supported around the arm member 36.

  As shown in FIGS. 1 and 2, a block 34 </ b> A that travels on the guide rail 7 and a block 34 </ b> B that travels on the guide rail 8 are fixed to the base 34. The base 34 is guided along the guide rail 7 and the guide rail 8 by the block 34A and the block 34B.

  The first guide roller 30 corresponds to a first guide member in the present invention, has a cylindrical side surface, and is supported by a support plate 32 by a rotation shaft 31 as shown in FIGS. Since the rotary shaft 31 is disposed in an inverted V shape, that is, in a C shape when viewed from the side surface, the first guide roller 30 is disposed in a V shape, that is, an inverted C shape as viewed from the side surface. . Accordingly, the first guide roller 30 is disposed so as to sandwich the path of the wire W from both sides, and at the same time, contacts the upper surface of the wire W, in other words, the surface opposite to the side contacting the cored bar 2. As shown in FIGS. 3 and 7, the first guide roller 30 is provided with a wire rod in the vicinity of the winding start position as viewed from the end surface of the cored bar 2 by the support plate 32, the arm-shaped member 36, and the base 34. It moves parallel to the axis of the core metal 2 while being held at a position offset to the means side, in other words, the second guide portion 4 side.

  As shown in FIGS. 1 and 2, the arm-like member 36 is supported by a ball screw mechanism 35 provided on the base 34 so as to be vertically movable. The ball screw mechanism 35 includes a ball screw 35A supported on the base 34, a nut portion 35B fixed to the arm-like member 36 and screwed into the ball screw 35A, and a motor 35C that rotates the ball screw 35A. Has been. When the motor 35C rotates, the nut portion 35B moves up and down, and the heights of the arm-like member 36 and the support plate 32 are set. Thereby, the height of the first guide roller 30 is also set.

  As shown in FIGS. 1 to 3, the second guide portion 4 includes a pair of second guide rollers 40 that are rotatably supported around a pair of rotation shafts 41, and a second guide roller 40 that is pivotally supported. The upper and lower ends are supported and guided by the plate-shaped support plate 42, the ball screw mechanism 6, the guide rail 7 and the guide rail 8, and the base 44 is horizontally supported at the base portion. It has an arm-like member 46 that supports the support plate 42 in parallel with the vertical plane at the tip.

  A block 44 </ b> A that travels on the guide rail 7 and a block 44 </ b> B that travels on the guide rail 8 are fixed to the base 44. The base 44 is guided along the guide rail 7 and the guide rail 8 by the block 44A and the block 44B.

  The second guide roller 40 corresponds to a second guide member in the present invention, has a cylindrical side surface, and is pivotally supported on a support plate 42 by a rotation shaft 41 as shown in FIGS. The second guide roller 40, the rotation shaft 41, and the roller support plate 42 reverse the arrangement of the first guide roller 30, the rotation shaft 31, and the support plate 32 in the first guide portion 3 shown in FIGS. 4 to 6. Is taking the arrangement. Accordingly, since the rotary shaft 31 is disposed in a V shape, that is, an inverted C shape as viewed from the side, the second guide roller 40 is disposed in an inverted V shape, that is, a C shape, as viewed from the side. Yes. Therefore, the second guide roller 30 is disposed so as to sandwich the path of the wire W from both sides, and simultaneously contacts the lower surface of the wire W, in other words, the surface that contacts the cored bar 2. Further, as shown in FIGS. 3 and 7, the second guide roller 40 is supported by the support plate 42, the arm-like member 46, and the base 44 from the wire supply means side of the first guide roller 30, in other words, from the core metal. It is arranged far away and moves parallel to the axis of the cored bar 2.

  As shown in FIGS. 1 and 2, the arm-like member 46 is supported by a ball screw mechanism 45 provided on the base 44 so as to be vertically movable. The ball screw mechanism 45 includes a ball screw 45A supported on the base 44, a nut portion 45B fixed to the arm-like member 46 and screwed into the ball screw 45A, and a motor 45C that rotates the ball screw 45A. Has been. As the motor 45C rotates, the nut portion 45B moves up and down, and the height of the arm-like member 46 and the support plate 42 is set. Thereby, the height of the first guide roller 40 is also set.

  As shown in FIGS. 1 and 2, the ball screw mechanism 5 is engaged with the ball screw 50 supported at both ends in parallel to the substrate 9 and horizontally, and the ball screw 50 and the first guide portion 3. A nut portion 52 fixed to the upper end portion of the base 34 and a motor 54 for rotating the ball screw 50.

  Similarly, as shown in FIGS. 1 and 2, the ball screw mechanism 6 is screwed into the ball screw 60 and the ball screw 60 that is supported in parallel and horizontally with respect to the substrate 9 at both ends. The nut part 62 fixed to the upper end part of the base 44 of the guide part 4 and the motor 64 which rotates the ball screw 60 are provided.

Hereinafter, the operation of the winding machine 1 will be described.
Before the start of winding, the first guide portion 3 and the second guide portion 4 are moved to the winding start position by the ball screw mechanism 5 and the ball screw mechanism 6, respectively. Accordingly, as shown in FIG. 7A, the first guide roller 30 and the second guide roller 40 are held at positions adjacent to the flange portion 20 of the core metal 2.

  When the wire rod W is supplied by the supply means, the supplied wire rod W is guided along the direction perpendicular to the axis of the core metal 2 by the first guide roller 30, the second guide roller 40, and the flange portion 20, and the core metal 2 and the clamp part 22.

  When the wire W is introduced between the metal core 2 and the clamp part 22, the wire W is held at the winding start position by the clamp part 22 and the metal core 2, and the metal core 2 is held by the coil spring as indicated by an arrow a. Rotate in the winding direction. At the same time, the first guide portion 3 and the second guide portion 4 are moved at a predetermined speed toward the other end portion of the core metal 2, that is, the end portion on the side where the motor 24 is provided, as indicated by arrows b and c, respectively. By moving, the wire is spirally wound around the surface of the cored bar 2 at a constant pitch angle θ1 as shown in FIGS. 7B and 8A to form a coil spring.

  In order to increase the pitch angle from θ1 to θ2 on the way, the moving speed vc of the second guide portion 4 is first increased as shown in FIG. 8B. As a result, the wire W is bent in the direction of arrow c around the first guide roller 30 of the first guide portion 3. When the wire W is bent and the pitch angle increases to θ2, the moving speed vb of the first guide part 3 is increased to a speed equal to the moving speed vc of the second guide part 4, and the wire W is wound. continue.

  Further, as shown in FIG. 10, when forming a coil spring having flat seats at both ends, winding of the wire W may be started in the following procedure. First, as shown in FIG. 9A, the core metal 2 is rotated in a state where the first guide portion 3 and the second guide portion 4 are stopped at a position adjacent to the flange portion 20 of the core metal 2, and the flange The wire W is wound along the portion 20. Thereby, a flat seat is formed. When the flat seat is formed, first, the movement of the second guide portion 4 is started as shown in FIG. 9B, and the wire W is bent until the pitch angle becomes θ1. When the wire W is bent, the first guide part 3 is moved at a speed equal to that of the second guide part 4. When the wire W is wound around the core metal 2 by a predetermined number of turns, first, the second guide part 4 is stopped, and when the pitch angle of the wire wound around the core metal 2 becomes 0, the first guide part 3 is moved. Stop.

  In the winding machine 1 of the first embodiment, the first guide roller 30 in the first guide unit 3 and the second guide roller in the second guide unit 4 are driven and stopped by the ball screw mechanism 5 and the ball screw mechanism 6. 40 moving speeds can be controlled independently. Moreover, since the 1st guide roller 30 hold | maintains the wire W in the position offset from the winding start position of the clamp part 22, it can control the pitch and pitch angle of the wire W from the time of winding start.

  Therefore, flat seats can be easily formed at both ends of the coil spring, and as shown in FIG. 9, the coil spring can be raised immediately from the flat seat at a predetermined pitch angle θ1. Therefore, a coil spring having stable spring characteristics and having no corrosion when the wires are rubbed against each other when being contracted, and is resistant to corrosion can be obtained.

  Furthermore, as shown by a solid line in FIG. 11, the pitch angle of the coil spring can be accurately controlled when the pitch angle is increased from θ1 to θ2 during the winding of the coil spring and returned to θ1 again. On the other hand, in the conventional winding machine, the pitch angle shifts from θ1 to θ2 or shifts from θ2 to θ1 at the portion where the pitch of the coil spring changes as indicated by a broken line or a two-dot chain line in FIG. It is necessary to provide a transition part.

  In addition, in the first guide portion 3, the wire rod W is pressed from above by a pair of guide rollers 30, and in the second guide portion 4, the wire rod W is supported from below by a pair of guide rollers 40. Therefore, the wire W is smoothly fed.

2. Embodiment 2
Another example of the winding machine included in the coil spring forming apparatus of the present invention will be described below. Hereinafter, the same reference numerals as those in FIGS. 1 to 9 denote the same elements as those shown in these drawings.
As shown in FIG. 12, the winding machine 10 according to the second embodiment uses a cylindrical cored bar 2 around which the wire W is wound and a wire W supplied from a supply unit (not shown) as a cored bar. A first guide part 3 and a second guide part 4 that are guided toward the second side.

  As shown in FIGS. 12, 13, and 14, the first guide unit 3 includes a first guide roller 130 that rotates in contact with the wire W, and the first guide roller 130 around a horizontal rotation shaft 131. The upper and lower ends are supported and guided by the support plate 32 that supports the rotation, the ball screw mechanism 5, the guide rail 7, and the guide rail 8, and the base 34 is supported at one end and the other end. And an arm-like member 36 that supports the support plate 32 rotatably around a vertical rotation axis.

  The first guide roller 130 corresponds to the first guide member in the present invention, and as shown in FIG. 14, the first guide roller 130 is formed in a pulley shape whose side surface is recessed in an arc shape, and abuts against the wire W on the side surface recessed in the arc shape. . As shown in FIGS. 13 and 16, the first guide roller 130 supplies the wire in the vicinity of the winding start position when viewed from the end surface of the cored bar 2 by the support plate 32, the arm-like member 36, and the base 34. It moves parallel to the axis of the core metal 2 while being held at a position offset to the means side, in other words, the second guide portion 4 side.

  The arm-like member 36 is supported on the base 34 via a height adjusting member 37 as shown in FIG. The height adjusting member 35 is configured to be vertically movable with respect to the base 34 by a height adjusting screw (not shown). By moving the height adjustment member 37 up and down, the height of the arm-like member 36 and the support plate 32 can be set, and thereby the height of the first guide roller 130 is also set.

  As shown in FIGS. 12, 13, and 15, the second guide portion 4 includes a pair of second guide rollers 140 that are rotatably supported around a pair of rotation shafts 141, and the pair of second guide rollers 140. A base 44 whose upper and lower ends are supported and guided by a plate-like support plate 42 that supports the rotary shaft 141 in a “C” shape when viewed from the front, and the ball screw mechanism 6, the guide rail 7, and the guide rail 8. And an arm-like member 46 that is horizontally supported by the base 44 at the base portion and supports the support plate 42 parallel to the vertical surface at the tip portion.

  As shown in FIG. 15, the second guide roller 140 has a cylindrical side surface, and as described above, the two second guide rollers 140 are pivotally supported by the rotating shaft 141 so as to be spaced upward. Yes. Accordingly, the second guide roller 140 is disposed so as to sandwich the path of the wire W from both sides, and at the same time, contacts the upper surface of the wire W, in other words, the surface opposite to the side contacting the cored bar 2.

  As shown in FIG. 12, the arm-like member 46 is attached to the height adjusting member 47 by a screw 45B, and the height adjusting member 47 is attached to the base 44 by a height adjusting screw 47A so as to be vertically movable. In addition, a long hole through which the screw 47B is inserted opens in the base portion of the arm-like member 46 along the horizontal direction. The height of the second guide roller 140 can be set by moving the height adjustment member 47 up and down with respect to the base 44 by the height adjustment screw 47A, and the arm 47 is moved in the horizontal direction by loosening the screw 47B. Thus, the position in the horizontal direction can be set. The second guide roller 140 is held at a position farther from the core metal 2 than the first guide roller 130 in the first guide portion 3.

  Except for the above points, the winding machine 10 has the same configuration as the winding machine 1 according to the first embodiment.

Hereinafter, the operation of the winding machine 10 will be described.
Before the start of winding, the first guide portion 3 and the second guide portion 4 are moved to the winding start position by the ball screw mechanism 5 and the ball screw mechanism 6, respectively. Accordingly, as shown in FIG. 16A, the first guide roller 130 and the second guide roller 140 are held at positions adjacent to the flange portion 20 of the core metal 2.

  When the wire W is supplied by the supply means, the supplied wire W is guided by the first guide roller 130, the second guide roller 40, and the flange portion 20 along the direction perpendicular to the axis of the core metal 2, and the core metal 2 and the clamp part 22.

  When the wire W is introduced between the metal core 2 and the clamp part 22, the wire W is held at the winding start position by the clamp part 22 and the metal core 2, and the metal core 2 is held by the coil spring as indicated by an arrow a. Rotate in the winding direction. At the same time, the first guide portion 3 and the second guide portion 4 are moved at a predetermined speed toward the other end portion of the core metal 2, that is, the end portion on the side where the motor 24 is provided, as indicated by arrows b and c, respectively. By moving the wire, the wire is spirally wound around the surface of the cored bar 2 at a constant pitch angle θ1, as shown in FIG. 16B, and a coil spring is formed.

FIG. 1 is a perspective view showing the overall configuration of the winding machine according to the first embodiment. FIG. 2 is a front view illustrating the overall configuration of the winding machine according to the first embodiment. FIG. 3 is a schematic diagram illustrating a configuration of the first guide roller, the second guide roller, the cored bar, and the periphery thereof of the winding machine according to the first embodiment. FIG. 4 is an enlarged cross-sectional view showing a configuration of a first guide roller provided in the winding machine shown in FIG. FIG. 5 is an enlarged side view showing the configuration of the first guide roller provided in the winding machine shown in FIG. FIG. 6 is an enlarged top view showing the configuration of the first guide roller provided in the winding machine shown in FIG. FIG. 7 is an explanatory diagram showing a procedure until the winding is started after the wire rod is supplied to the metal core in the winding machine shown in FIG. FIG. 8 is an explanatory diagram showing the movement of the first guide roller and the second guide roller when the pitch angle for winding the wire around the metal core is changed from θ1 to θ2 in the winding machine shown in FIG. FIG. 9 is an explanatory diagram showing a procedure for forming a coil spring having a flat seat at the end in the winding machine shown in FIG. 1. FIG. 10 is a side view showing an example of a coil spring having flat seats at both ends. FIG. 11 shows the pitch of the coil spring and the wire when the pitch angle is increased from θ1 to θ2 in the middle of forming the coil spring and returned to θ1 for the winding machine of the first embodiment and the conventional winding machine. It is explanatory drawing which shows the relationship with the number of turns of. FIG. 12 is a perspective view showing the overall configuration of the winding machine according to the second embodiment. FIG. 13 is a schematic diagram illustrating a configuration of the first guide roller, the second guide roller, the cored bar, and the periphery thereof of the winding machine according to the second embodiment. FIG. 14 is an enlarged view showing the configuration of the first guide roller provided in the winding machine shown in FIG. FIG. 15 is an enlarged view showing the configuration of the second guide roller provided in the winding machine shown in FIG. 12 and its surroundings. FIG. 16 is an explanatory diagram showing a procedure from supplying a wire to the core bar and starting winding in the winding machine shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Winding machine 2 Core metal 3 1st guide part 4 2nd guide part 5 Ball screw mechanism 6 Ball screw mechanism 7 Guide rail 8 Guide rail 9 Substrate 10 Winding machine 20 Flange part 22 Clamp part 24 Motor 30 1st guide roller 32 Roller support portion 34 Base 35 Height adjustment member 36 Arm-shaped member 40 Second guide roller 41 Rotating shaft 42 Support plate 44 Base 45 Ball screw mechanism 45A Ball screw 45B Nut portion 45C Motor 46 Arm-shaped member 47 Height adjustment Member 50 Ball screw 52 Nut portion 54 Motor 60 Ball screw 62 Nut portion 64 Motor 130 First guide roller 140 Second guide roller

Claims (3)

A cylindrical core bar that rotates around an axis;
A clamp that is provided at one end of the core bar and rotates integrally with the core bar;
  A first guide member and a second guide member which are provided so as to be movable independently from each other along a direction parallel to the axis of the core metal, and which guide the wire onto the core metal;
A coil spring forming apparatus having
  While the one end of the wire to be wound around the core is gripped on the core by the clamp portion, the wire is supplied from the wire supply means toward the core, and the core is While rotating around,
  The first guide member and the second guide in a state where the first guide member is in contact with a wire between the second guide member that contacts the wire and a position where the wire starts to be wound around the core. The member is moved from one end of the core bar toward the other end, and the wire is wound around the core bar
Coil spring forming method. At the start of winding of the wire rod, a portion adjacent to the portion of the wire rod that is gripped on the core metal by the clamp portion is closer to the core metal side of the first guide member and the second guide member. The method of forming a coil spring according to claim 1, wherein the coil spring is held by the arranged first guide member . A first portion having the first pitch angle θ1 and a second pitch angle θ2 different from the first pitch angle θ1 are formed by the coil spring forming method according to claim 1 or 2. A coil spring having a transition portion where the pitch angle continuously transitions from θ1 to θ2 between the first portion and the second portion.

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